31431469 has 2 divisors, whose sum is σ = 31431470. Its totient is φ = 31431468.

The previous prime is 31431451. The next prime is 31431479. The reversal of 31431469 is 96413413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 8054244 = 4835^2 + 2838^2 .

It is a cyclic number.

It is not a de Polignac number, because 31431469 - 2⁹ = 31430957 is a prime.

It is a super-2 number, since 2×31431469² = 1975874486995922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1940908 and since 31431469 and 1940908 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31431469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715734 + 15715735.

It is an arithmetic number, because the mean of its divisors is an integer number (15715735).

Almost surely, 2^31431469 is an apocalyptic number.

It is an amenable number.

31431469 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431469 is an equidigital number, since it uses as much as digits as its factorization.

31431469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 31431469 is about 5606.3775292073. The cubic root of 31431469 is about 315.5887837281.

The spelling of 31431469 in words is "thirty-one million, four hundred thirty-one thousand, four hundred sixty-nine".